Nozzle with a rotating jet

ABSTRACT

The invention relates to a nozzle ( 1 ) with a rotating jet, said nozzle consisting of a static body ( 2 A) defining an open cavity ( 2 B) containing an injector ( 2 C). One end of the injector ( 2 C) is driven in a circular movement about a pivot ( 2 D) of the body ( 2 A) under the effect of water pressure having a tangential flow rate and acting on the injector ( 2 C), while the other end of said injector ( 2 C) is provided with a spray nozzle ( 2 E) and is arranged in the opening of the cavity ( 2 B) in the form of a concave seat ( 2 F) enabling the precession movements of the injector. The inventive nozzle is characterised in that the inner diameter (d 1 ) of the spray nozzle ( 2 E) measures between 2.8 and 6 mm while the smallest diameter (d 2 ) of the seat ( 2 F) measures between 4 and 11.5 mm, the smallest diameter (d 2 ) of the seat ( 2 F) being 1.7 times larger ±10 % than the inner diameter (d 1 ) of the spray nozzle ( 2 E) in such a way as to enable the inventive nozzle to be supplied under a medium pressure.

The present invention relates to a nozzle with a rotating jet of thetype constituted by a stationary body delimiting an open cavityreceiving an injector.

It relates more particularly to a nozzle with a rotating jet of thementioned type, of which one end of the injector is driven with circularmovement about a pivot of the body under the force of water withtangential flow acting on said injector, whilst the other end of thisinjector, provided with a spray nozzle, is disposed in an opening of thecavity in the form of a concave seat permitting precessional movementsof the injector.

Such nozzles can particularly be used in the case of sprayinginstallations. Until now, these nozzles with a rotating jet could not besupplied with medium pressure fluids because of the dimensionalcharacteristics of these nozzles.

An object of the present invention is thus to provide a nozzle withwhich the dimensional characteristics permit supply of such a nozzle bymeans of a fluid flow under medium pressure, which is to say having apressure generally comprised between 20 and 60 bars.

To this end, the invention has for its object a nozzle of the mentionedtype, characterized in that the internal diameter of the spray nozzle iscomprised within the range 2.8 to 6 mm whilst the smallest internaldiameter of the seat is comprised within the range of 4 to 11.5 mm, theinternal diameter of the seat being 1.7 times greater than the internaldiameter of the spray nozzle ±10%, so as to permit medium pressuresupply of the nozzle.

The invention will be better understood from a reading of the followingdescription of embodiments, with reference to the single FIGURE, whichshows a cross-sectional view of a nozzle according to the invention.

As mentioned above, the nozzle with rotating jet, called a rotanozzle,according to the invention, indicated generally at 1, is moreparticularly adapted to be installed in medium pressure pumpinginstallations. This nozzle is constituted by a stationary body 2A ofgenerally truncated conical shape, delimiting a open cavity 2B receivingan injector 2C. This injector 2C is basically in the form of acylindrical body provided with an axial through conduit. One end of theinjector 2C is driven with circular motion about a pivot 2D of the body2A under the force of tangential water flow acting on said injector 2C.The other end of this injector 2C is provided with a spray nozzle 2E.The spray nozzle 2E has the shape of a tubular body provided with anaxial through conduit. One end of this body is enlarged to form a convexspray nozzle head. The proximal surface of this enlargement constitutesan axial abutment during ensleeving of the spray nozzle 2E in the axialthrough conduit of the injector 2C. This end of the injector 2C,provided with a spray nozzle 2E with a convex head, is disposed in theopening of the cavity 2B shaped as a concave seat 2F permitting theprecessional movements of the injector.

As the spray nozzle 2E, adapted to come into bearing against the wallsof the concave seat 2F, comprises rounded portions giving the head ofthe spray nozzle a generally semispherical shape, the movements of thespray nozzle 2E within the seat 2F are facilitated.

In a manner characteristic of the invention, the internal diameter d1 ofthe spray nozzle 2E is comprised within the range 2.8 to 6 mm, whilstthe smallest internal diameter of the seat 2F is comprised within therange 4 to 11.5 mm. Thus, the smallest internal diameter d2 of the seatis 1.7 times greater than the internal diameter d1 of the spray nozzle,±10%, so as to permit a medium pressure supply of said nozzle.

The seat 2F is provided by means of a piece connected in the opening ofthe cavity 2B, this opening of the cavity 2B constituting the outletorifice of the jet. The seat 2F has the shape of a semispherical cupopen at its base to delimit a passage for the outlet of the fluid flow,the diameter of this outlet passage for fluid flow of the seatcorresponding to the smallest internal diameter d2 mentioned above.

In the illustrated example, the seat 2F has the shape of a semisphericalcup, the bottom of the semispherical cup opening into a second cavity ofgenerally semispherical shape, the bases of the half spheres beingtangent so as to delimit a passage for fluid in the general shape of anhourglass.

The spray nozzle 2E and the seat 2F are made of a material such ascarbide, of higher hardness than that of the materials constituting thebody 2A and the injector 2C of the nozzle, so as to reduce wear of theassembly.

1-4. (canceled)
 5. Nozzle (1) with a rotating jet of the typeconstituted by a stationary body (2A) delimiting an open cavity (2B)receiving an injector (2C) whose one end is driven with circular motionabout a pivot (2D) of the body (2A) under the effect of water pressurewith tangential flow acting on said injector (2C) whilst the other endof this injector (2C), provided with a spray nozzle (2E), is disposed inthe opening of the cavity (2B) in the form of a concave seat (2F)permitting the precessional movements of the injector, characterized inthat the internal diameter (d1) of the spray nozzle (2E) is comprisedwithin the range of 2.8 to 6 mm, whilst the smallest diameter (d2) ofthe seat (2F) is comprised in the range of 4 to 11.5 mm, the smallestdiameter (d2) of the seat (2F) being 1.7 times greater, ±10%, than theinternal diameter (d1) of the spray nozzle (2E) so as to permit mediumpressure supply of said nozzle.
 6. Nozzle (1) with a rotating jetaccording to claim 5, characterized in that the spray nozzle (2E) andthe seat (2F) are made of a material, such as carbide, of hardnessgreater than that of the materials constituting the body (2A) and theinjector (2C) of the nozzle, so as to reduce wear of the assembly. 7.Nozzle (1) with a rotating jet according to claim 5, characterized inthat the seat (2F) has the shape of a semispherical cup open at its baseto delimit a passage for the outlet of the fluid flow, the diameter ofthis outlet passage for the fluid flow of the seat corresponding to thesmallest internal diameter (d2) comprised within the range of 4 to 11.5mm.
 8. Nozzle (1) with rotating jet according to claim 5, characterizedin that the seat (2F) is provided by means of a piece connected in theopening of the cavity (2B), this opening of the cavity (2B) constitutingthe outlet opening of the medium pressure jet of the nozzle.
 9. Nozzle(1) with a rotating jet according to claim 6, characterized in that theseat (2F) has the shape of a semispherical cup open at its base todelimit a passage for the outlet of the fluid flow, the diameter of thisoutlet passage for the fluid flow of the seat corresponding to thesmallest internal diameter (d2) comprised within the range of 4 to 11.5mm.
 10. Nozzle (1) with rotating jet according to claim 6, characterizedin that the seat (2F) is provided by means of a piece connected in theopening of the cavity (2B), this opening of the cavity (2B) constitutingthe outlet opening of the medium pressure jet of the nozzle.
 11. Nozzle(1) with rotating jet according to claim 7, characterized in that theseat (2F) is provided by means of a piece connected in the opening ofthe cavity (2B), this opening of the cavity (2B) constituting the outletopening of the medium pressure jet of the nozzle.